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21. Which of the following has the most penetrating power?
22. A liquid initially contracts when cooled down to 4°C but on further cooling down to 0°C, it expands. The liquid is
23. By which one of the following, an old written material which cannot be read easily, can be read?
24. An athlete diving off high springboard can perform a variety of exercise in the air before entering the water body . Which one of the following parameters will remain constant during the fall?
- A. The athlete's linear momentum
- B. The athlete's angular momentum
- C. The athlete's kinetic engine
- D. The athlete's moment of inertia
- Check Answer | Discussion
25. How is the pressure cooker work?
- A. Heat cannot escape from the cooker
- B. Low pressure inside the cooker rises the boiling point of water
- C. High pressure inside the cooker rises the boiling point of water
- D. Steam inside the cooker makes food to cook with ease
- Check Answer | Discussion
26. Two thin wooden sticks are floating on the surface of water closer to each other. A hot needle touches the water between them. How will the sticks react to it
27. Select the correct answer
- A. two satellites moving the same circular orbit have the same angular momentum
- B. two satellites moving the same circular orbit have the same mass
- C. two satellites moving the same circular orbit have the same energy
- D. two satellites moving the same circular orbit have the same force
- Check Answer | Discussion
28. You placed car in an open a parking area in a summer day. After a few hours, you noticed that the heat is trapped inside the car. This phenomenon is known as
29. If two conducting spheres are separately charged and then brought in contact
- A. the total energy of the two spheres is conserved
- B. the total energy on the two spheres is conserved
- C. both the total charge and the total charge are conserved
- D. the final potential is always the mean of the original potential of the two spheres
- Check Answer | Discussion
30. The weight of an object may be assigned using Newton's
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